A comma separated list of addresses for destinations (required).
This property specifies a comma separated list of destinations for the mail message. A copy of the message is sent to each of them, and a To SMTP header is created containing the destination addresses.
Examples of valid addresses are: "Friendly Name" <email@example.com> or firstname.lastname@example.org
The component will fail if the MailServer returns an error code about any email address specified in SendTo or Cc but it will silently ignore the error if the same happens with an email address specified in BCc.
If the resulting header is longer than MaxHeaderLength, then it is folded according to RFC 822 specifications.
NOTE: You must clear the MessageRecipients collection before setting this property to remove previous recipients.